AW = Attention Whore

BF = Boyfriend or Best Friend

BM = Bridesmaid or Best Man

BP = Bridal Party

DF = Dear (or darned, or dratted, or …) Fiancé

DH = Dear Husband

DIY = Do-it-yourself

E-ring = engagement ring

FG = Flower Girl

FI = Fiancé

FIL = Father In Law

FILs = Future in-laws, sometimes referred to as:
      FBIL = Future Brother-in-law
      FFIL = Future Father-in-law
      FMIL = Future Mother-in-law
      FSIL = Future Sister-in-law

Flame = to tell someone that their plans are tacky/stupid/wrong, etc. Hence, "no flames" means "if you don't have something nice or constructive to say, then kindly stay out of the conversation."

GF = Girlfriend

GM = Groomsmen

GTG = a Knottie get-together
HM = Honeymoon

HTH = Hope this helps

IHO = In Honor Of

ILs = In-laws

IMHO = In my humble opinion

IMNSHO = In my not so humble opinion

JK = just kidding, or joking

JMO (or JMHO) = Just my (humble) opinion

JP = Justice of the Peace

LMAO = Laughing my @ss off

LOL = Laughing out loud

LTBM = Living together before marriage

MIL = Mother In Law

MOH = Maid / Matron of Honor

MUD - Made Up Drama

NMS = Not my style

NWMT = Not worth my time

NWR = Not Wedding Related

OMG = Oh my gosh / god

P&E = Planning and Etiquette board

PIB = Pictures in Bio

PIP = Picture in Post

PSA = Public Service Announcement

RB = Ring Bearer

RD = Rehearsal Dinner

RP = Repost

SAHM = stay-at-home mom

SAHW = stay-at-home wife

STDs = Save The Date cards

TIA = Thanks In Advance

TMI = Too Much Information

TY = Thank you

WP = wedding party

WW = Weight Watchers

XP = Cross posted (posted to more than one board)